Feature request: actions on target manager release

[rihter007]

I would like to do some logging on a target after each test run no matter whether it succeeds or fails.
Currently to do so, I need to implement this logic in ReleaseTargets() method that will be unique for each TargetsManager, while it looks like these actions should be common and shared across all of them.

CC: @tfg13 , @rminnich , @insomniacslk